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Risks and Financial Instruments - Summary of foreign exchange hedging instruments designated as fair value hedge (Detail)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about hedges [line items]        
Notional amount – US$ | $     $ 90,000 $ 90,000
Result of hedging instruments - gain/(loss) - R$ R$ (10,088) R$ 6,528    
Fair value adjustment of debt - R$ 11,756 3,250    
Financial expense in the statements of profit or loss - R$ R$ 5,914 R$ 8,968    
Average effective cost - DI % 99.90% 99.90%    
Ipiranga [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount – US$ | $     188,621 65,523
Result of hedging instruments - gain/(loss) - R$ R$ (129,670) R$ (87,448)    
Fair value adjustment of inventories – R$ (4,352) 18,468    
Foreign exchange hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount – US$ | $     175,000 235,000
Result of hedging instruments - gain/(loss) - R$ 21,812 574,378    
Fair value adjustment of debt - R$ 47,064 (13,131)    
Financial expense in the statements of profit or loss - R$ R$ 105,059 R$ 597,735    
Average effective cost - DI % 104.90% 104.10%    
Interest rate hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount – US$ | $     $ 2,226,054 $ 806,054
Result of hedging instruments - gain/(loss) - R$ R$ (17,922) R$ 67,446    
Fair value adjustment of debt - R$ 166,374 (18,446)    
Financial expense in the statements of profit or loss - R$ R$ 245,710 R$ 99,555    
Average effective cost - DI % 102.00% 95.80%